It takes a long time to wear out a Birkenstock, a favorite sandal of Boomers (with or without socks). Here's a comparison of a new pair to an old pair worn daily
Why Birkenstock Sandals Sustained Their Cool for Nearly 250 Years
The Shoes Beloved by Deadheads and Skaters, Updated for the Fashion Set - The New York Times
Birkenstock Arizona Stone | Birkenstock Unisex Sandals – Footwear etc.
Birkenstock Sandals 39 250 L8 M6 | eBay
Birkenstock Antique White Boston Clogs | SHOPBOP
Why L Catterton and Financière Agache snapped up Birkenstock | Vogue Business